The projection is simple: one vp on ground projecting inside a trapezoidal box. All the compositing was done for the length from vp to box , with masks inside and its optic
All video was edited and composed for this ratio of distance and angle.
Its only flat quad projected
I would like to avoid 3d software to edit this trapezoidale box directly.
I would like to know if there is any way to recreate in vvvv a mesh simply for this and compense by camera position a new distance and angle .
The ground doesn t matter , there is 4 spaces of projection: center, sides and top
hi DiMiX, nice to read you ;-)
hum i will surely use homography for something else. but helas not that one.
i cant focus enough texture correctly ( texture transform pin of the quad) to obtain the global image being one.
i put here some snapshot of the source itself, showing edge. but there are a lot of things working on the general image also, passing from one plane to the other.
hi DiMiX, yes i have played around a bit with it.
i agree with you totally. i will try tomorow to see if i can find solution. its maybe by using keying that i could sort this… on 4 crops of the original image using at end homography on the 4 outputted textures…
I can see the masks, but I don’t see the deformations. The images above all are flat, just masked for the four surfaces. So is the issue that the mask lines were assuming a certain projection geometry, correct?
Have you tested the new projector position and know there is a noticeable problem? If the projectors are a normal/long distance away, I would think you could move them quite a bit (closer/farther) without seeing much difference. Particularly if you took care to align the back wall lines, you should be able to mask spill around the outer edges. I like to try the low-tech approaches first!
Aha! Check out girlpower(slide projector) - it should work. Build your box with four quads, “project” your video on to it using the old projector position, and set your camera to the new projector position.